Geez! I wish I could find a 75 gallon for $75! They are like $200 at petsmart! That is a huge markup!
A 75g is $179.99 w/free shipping from Petco.com. I lucked out and got my 75g for $200 w/stand, filters, heaters, (one was a recalled stealth which I took back to Petsmart for $50 back) and it also came with 60lb. of amazonia.
Watch on your local Craigslist and areas near by. I had to drive a few hours to get mine but it was worth it.